Paper lath



Aug. 23, 1932 w. D. JARVIS PAPER LATH Filed May 51, 1930 iZa - Patented Aug. 23, 1932 Y UNITED STA "iP T- N Q C is WALTERD. JARVIS, or rrrrsnunen, rEnnsYLvAivIA, assrenon, Bra/issue ssIGN ivI-Eu'r-s, mo MARY EAINES MARKS, or, snWIcKLn PENNSYLVANIA" 7 rArnnrArH Application mea'ma 31,1930. Seriai No. 458,068,;

My invention pertains to paper lath and relates especially to paper lath of the characterin which a backing of Corrugated paper, or paper-like material, having metallic stif- Mfi fening devices secured thereto is employed. In building construction, it has become common to employ what is known as paper lath, that is to say lath constituted by a backing of paper, or paper-like material, to which is applied plaster, concrete or kindred cementitious substances such as are used in building construction, which substances are intended to be included whenthe term plaster is usedherein. Paper formed with cor-' rugationshas been found to be desirable for the backing, since the plaster, filling the corrugations, is keyed .to the backing, and also the corrugations produce projections, at the rear of the backing, which space the lath in a desirable manner from the studding or other support which is to carry the plaster. It is found in practice, however, that such corrugated paper backings tend tosag, and the corrugations thereof to straighten out,

25 when the wet plaster is applied thereto.

Various undesirable conditions result from this. For instance, when the lath is em ployed'horizontally; the backing, and the wholebody of plaster, is liable to sag down wardly. On the other hand, when the lath is employed vertically, the backing is liable to sag inwardly under the pressure of the trowel or other implement by means of which the plasteris applied, and subsequently, after the plaster has been applied,' tospring outwardly, the result being that the surface of the plaster is waved instead of flat. Various means have been proposed from time to time to prevent collapse of the corrugations in further object of my invention to provide such paper backings, and to stiffen the whole such paper lathhaving means for stiffening the same against sagging, in which thes'tifi ening meansconstitute a keying means, for the plasterrand' also operate as a reinforcement for the-latter. Still another object of my invention is to provide paper lath having stiffening means, .of such a character that adjoining sections can be readily lappedone over. the other, thereby r'educingthe number of nails or other means necessary for securing the lath to the studs or the likeand at the same time avoiding any diminution of supporting power along the lines where the lath sections adjoin each other. And other and further objects of the invention will appear from the following specification, taken .in connection with the claims annexedthere- By way of example, I have described in the following specification, and shownin the accompanying drawing,one form'of paper lath embodying: my invention; It is to be understood, however, that the invention'may be embodied in other forms, and changes made in the form described and shown, without ex 5 ceeding the scope thereof as. defined in the appended'claim's. I t V In the drawing, Fig. 1 isv a front View showing sections ofpaper lath embodying myinvention as applied to studding; Fig. 2 is an enlarged front view ofa corner ofa lath section; Fig. 2a;isan enlarged detail section through-one of the bridge members, the section being taken on. the lineIIwIIa' of Fig. 2; Fig: 3 a cross-section .taken on the line IIIIII of Fig. 2; and Fig/4t is a fragmentary view showing a modification. Referring now to the drawing, the section of paper lath shown therein comprises a backshown in the top, bottom and middle corrugations) are disposed V-shaped metalhc stlifening strips 4 which, in the particular em-.

bodimentshown, are of a shape corresponding with that of the corrugations 2 and ar- Spaced along the length of the backing sheet,

at "right 'anglestdthe corrugations 2, are

sheet metal bridge members fi, 'ofU shape-in V away from them, either by reason of the cross section, these members being securedin place by staples 6, oneat each corrugation. The staples 6 bridge the ,corrugationsQ diagonally, their ends being passed through the backin'g sheet and crimped down at'lthe back of the:- same, vas indicated at 6a,"c1ose;;to the edges of sthe corrugations. The :operationof applying the staples causes :indentations 5a (Fig.3.) .to'be'formed in';the:hridge1mem- :bers ;5 at sthe points where :the staples :cross such bridge imembers, whereby the ibridge members are securely locked against longitu- 'dinallgmov emen't. Art the points where the bridge member-s S -cross the stiffening strips d, the staples:hol'dztheibridge members firmly down on .the .stifieningl-stnips, thereby iploducingza'structure whichiis firmiandhrigid as a whole. p

- The above-described constructionof lath is such that ithe "sections are relatively .:rigid,

giving a-avery zfirmsupport Eto .th'e'plaster sand V being easily handled. An important feature is ithat wlhile kstiflening members are employed, the end parts of :the sections are neverth'eless:capableof nesting one .on the other hy reason of the V'shape Dflthe membcrs it, the fact that'theilast bridge members 5 are located-eta substantial distance from the .:ends I of @the isections, :and the fact that the ends of :the sections are unobstructed fby reinforcing nettings or the like, When the i sections are made somewhat longer :than the distance spanning the centers :of "a. plurality of the studs 3,1this allows the end of oneseca to ilDG overlapped on the end of the .ad-

' joining sect-ion andtheitwo "sections to be secured in place by :a .singlerssetof (securing means, as by driving nails 7 sons to pierce the overlapped rstifl'ening members 4 :and

enter-the studs 3. This :ned'uces by ,one halff secure joint between the sections.

i be made to extend somewhat beyond the ends of 't'hcpaper backing, as indicated at 14min Fig. at; 1th :this censtruction the ends of the backing portions 1' of "the sections would 'being "securely bound ftothe stiffening "strips I keyed ito :the backing. Alsoythe pl-aster enbe butted' against each other on a stud; The ends of the stiffening members 400 of the ad joining sections would, however, overlap and lapping stiffening members, as before. y In the paper lath of :my :invention ;provision is effectively made against *sagg'ing of .the paper backing sheet and/oropening out of thecorrugationsthereof. The backing Q-andbridge me1nbers5 cannot, fof'co'urse, sag

weight of the plaster or of thepressure of thetrowiel; Qpening out of thecorrugations, which has heretofore been asource of trouble in paper lath ofithis .genera-ltype, is the fresult, :of course, 0f a tendency. of thebackihg sheet-.to :sag :and :is :avoided when such tendency is obviated, as is the case with 'myzconstructionc Moreover, as the :bridge members 5 are .secured to the backing at :the corrugations, and as zthe-stapleszcross the conrugas tions. and are secured on bDthsides -Ofithe lat? ter, any distortion of .thecorrugations is im-' possible. .The ipaperlath of my inventionhas further advantages, :an importantone of which is that :thc plasterenters corrugations 2 :and extends around and behind-the bridge members 55, whereby theplaster becomes ters 'ithe grooves; of the U-shaped bridge a members 5., which latter become partly or wholly embedded in the plaster, whereby. the plaster is further and verysecurely-keyed to the backing and,:in-addition,:isreinforced to an important extent. *An' additional 1advantage is that the paper-lathis=exceptionally economical of *m-anufacture," being readily produced by automatic machinery .and the elements th'ereof being of relatively small cost; a

Lola-imp I p V f 1. Paper lathwcomprisinga paper back-v" ing .sheet formed with longitudinal corms gati'ons, individual bridge members extend ing transversely of said :corrugat'ions and.

formed with indentationsat ipointsiwhere they cross the latter, and staples securingsa-id I bridge members to saidxsheet, said ista ple's resting in said indentations l L ...2. Paper lath comprising a' paper backing v sheet formed with longitudinal corrugations and individual bridge members extending transversely of said corrugations and secured to said backing sheet, said members being of no hollow structure to permit entry of plaster therein, whereby portions of'said members become embedded in plaster and said members 'constitutereinforcing and keying means for the plaster.

3. Paper lathcomprising-apaperbacking sheet formed with longitudinal c0rrugatiens and individual bridge'members extending transversely of said corrugations andv secured to said backing sheet, said members :being of 180 U-shape and disposed with their sides resting on said sheet, whereby portions of said members become embedded in plaster and said members constitute reinforcing means for the plaster.

4%. Paper lath comprising a paper backing sheet formed with longitudinal corrugations, individual bridge members extending transversely of said corrugations and staples se curing said bridge members to said sheet each staple spanning a corrugation and entering the sheet beyond each side of the latter so as to preserve the shape of the corrugation.

5. Paper lath comprising a paper backing sheet formed with longitudinal corrugations, aV-stifi'ening member disposed in one of said corrugations, individual bridge members ex tending transversely of said corrugations and staples securing said bridge members to said sheet each staple spanning a corrugation and entering the sheet beyond each side of the latter so as to preserve the shape of the corrugation.

6. Paper lath comprising a paper backing sheet formed with a series of longitudinal corrugations, stiffening members disposed in certain but not all of said corrugations, individual bridge members extending transversely of said corrugations, and staples securing said bridge members to said sheet each staple spanning a corrugation and entering the sheet beyond each side of the latter so as to preserve the shape of the corrugation.

In testimony whereof, I sign my name.

WALTER D. JARVIS. 

